package main     //声明文件所在的包，每个go文件都必须有归属的包

import "fmt"     

func main(){
const(
	age1 int= iota
	age2
	age3
	age4
	age5
	age6
)

	fmt.Println(age2)
	fmt.Println(age3)
	fmt.Println(age4)
	fmt.Println(age5)
	fmt.Println(age6)
}